Hot top for ingot molds



M885, 1931- I E. L. MESSLER ET AL 1,803,342

HOT TOP FOR INGOT MOLDS Filed Oct. 10, 1929 INVENTOR Euqena LMessle r'fiJames Thomas b, w a WWW their attor nega'.

Patented May 5, 1931 UNITED STATES PATENT OFFICE EUGENE 1.. MESSLER, orrir'rsnunen, AND JAMES THOMAS, on smPsvI'LLn PENNSYLVANIA now won FORmoon iaoLDs Application filed October 10, 1929. Serial No. 398,594.

This invention relates to hot to s, and constitutes a continuation inart our applicagion Serial No. 316,140, ed October 31st, 19 8.

It is wellv known in the art that a hot tog consists of a hollowrefractory body whio is fitted over aningot-mold to contain a volume ofmolten metal (after the ingot has been teemed) above that whichcomprises the inglot in the ingot-mold proper. This upper ody of metalflows downwardly and fills the so-called pipes which form within theingot as it cools.

According to usual practice a portion of the hot top extends into thebore of the ingotmold a slight distance downwardly past its upper edge.This serves to prevent molten metal from escaping between the ingot-moldand the hot top. In o oration, it is this ortion' of the hot top whichis destroyed. hat is to say, the metal of the ingot engages this.portion oiithe hot top, and in contracting during coolin tends tofracture it. The remainder of t e hot top above this downwardlyextending portion is relatively substantial.

' We propose to provide a hot top formed of several refractory members,which may he adequately assembled in position on an ingot-mold to servein the desired manner. That is, we do not form the downwardly extendingportion of the hot top integral with the remainder of the hot top, ashas been the practice heretofore. Qbviouslya, the lower portion. of thehot top maybe renewed each time that an ingot is cast, and the upperportion of the hot top may be used repeatedly.

To prevent molten metal from entering the joint between'the two hot topportions and forming a lateral fin on the sinlrhead,

weprovide a thin metal lining. it is with parted hot tops of thisnature, and with means to protect the joint between the several portionsof an assembled hpt top that our invention has to do.

In the accompanying drawings Figure I is a central vertical sectionalview, indicating .fragmentarily an ingot-mold, and showing the hot topof our invention operatively associated therewith; Figure II is. anelevation showing in plan the top of an ingot mold which has a flutedbore; Figure III is an elevation showing in bottom plan the lowerportion or member of the hot top; Figure 1V is 'an'elevation in planshowing the assembled hot top mounted on the ingot-mold; and Figure Visa view in section taken on the plane VV of Figure I. I

Referring .to the drawings, the reference numeral -1 indicates aningot-mold having the bore 2. Figure I illustrates generally a hot top,embodying the features of our invention, positioned on-the mold. The hottop comprises an upper refractory body 3, and a lower refractory member4. A portion 4a of the member 4 extends into the bore of the mold, andit fits snugly to prevent molten metal, as in teeming themold and hottop are filled, from escaping at the top 5 of the mold. Obviously, theportion 4a must be shaped to conform with the bore of the ingot-mold. Asthe member 4 is not integral vwith the other portions of the hot.top,'the upper member 3 thereof may be ofprotecting the line ofjointure between the two hot top portions, the metal lining memberprevents the molten metal from com. ing into direct contact with therefractory material of the top. This is desirable because it minimizesthe tendency of the hot top to spell, and to drop fragments into thesteel.

We have shown the hot top resting im mediately on no upper edge 5 of theingot mold, but it is to be understood that the assembled hot top may beblocked up in the manner known to the art. This is a 'well knownpractice, and no illustrations is deemed to be necessary; suffice it tosay, that our top is adaptable to this practice.

What we claim is:

1. A hot-top for ingot molds comprising an outer portion of refractorymaterial, said outer portion being formed of an upper and lower member,the lower member having a depending portion outwardly contoured to litthe inner surface of the ingot mold, and a thin metal lining memberarranged within the two refractory members aforesaid.

' 2. A hot-top for ingot molds comprising an outer portion of refractorymaterial, said outer portion being formed of an'upper and a lowermember, the lower member having a depending flange with its outersurface contoured to fit the inner surface of the ingot mold, the innersurface of said flange being of a section to correspond and align withthe inner surface of said upper member, and a lining member removablyarranged within the said refractory members.

In testimony whereof we have hereunto set our hands.

